linux-ext4 - Re: Best way to pin a page in ext4?

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Message-ID: <alpine.DEB.2.11.1409162230160.12769@gentwo.org>
Date:	Tue, 16 Sep 2014 22:31:24 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Hugh Dickins <hughd@...gle.com>
cc:	Theodore Ts'o <tytso@....edu>, Andreas Dilger <adilger@...ger.ca>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-mm <linux-mm@...ck.org>, linux-ext4@...r.kernel.org
Subject: Re: Best way to pin a page in ext4?

On Tue, 16 Sep 2014, Hugh Dickins wrote:

> On the page migration issue: it's not quite as straightforward as
> Christoph suggests.  He and I agree completely that mlocked pages
> should be migratable, but some real-time-minded people disagree:
> so normal compaction is still forbidden to migrate mlocked pages in
> the vanilla kernel (though we in Google patch that prohibition out).
> So pinning by refcount is no worse for compaction than mlocking,
> in the vanilla kernel.

Note though that compaction is not the only mechanism that uses page
migration.

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